CN103037221B - A kind of coding/decoding method of monitoring video file and system - Google Patents
A kind of coding/decoding method of monitoring video file and system Download PDFInfo
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- CN103037221B CN103037221B CN201210510026.1A CN201210510026A CN103037221B CN 103037221 B CN103037221 B CN 103037221B CN 201210510026 A CN201210510026 A CN 201210510026A CN 103037221 B CN103037221 B CN 103037221B
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- 238000011156 evaluation Methods 0.000 description 7
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Abstract
The present invention relates to a kind of coding/decoding method and system of monitoring video file, automatically decoding is attempted based on existing decoder, evaluate a kind of optimized decoder, eliminate the decoder that decoding effect is not good, efficiently solve cannot to the monitoring video file of unknown format decode cause cannot play, the problem such as frame data cannot be resolved.
Description
Technical field
The present invention relates to the video coding and decoding technology of protection and monitor field, especially the monitoring video file of unknown format is carried out to the method and system of decoding.
Background technology
Nearly ten years, China built video monitoring facility energetically, and monitoring video grows with each passing day, and also became the important evidence of public security organ's cracking of cases gradually.Due to the develop rapidly of Video Supervision Technique, people have been not content with the function that video recording is play, and are constantly excavating the value of monitoring video.And the prerequisite of everything is, needs can identify the internal structure of video file and decode, thus realize as functions such as intellectual analysis, video file compressions.Due to the composition structure that China's monitoring trade is comparatively complicated, there is oneself video file form in each producer, add some ciphertexts even hereof, cause using conventional means cannot be decoded and carry out format conversion, and traditional video coding and decoding technology only carries out decoding and changing for other video file of civil, as film, flash etc., cannot decode and format conversion to the monitoring video file of unknown format.
Summary of the invention
For solving the technical problem existed in prior art, the invention provides a kind of coding/decoding method and system of monitoring video file, for the particularity of monitoring video, utilize the technology such as the parsing of multiple decoder, frame of video, image quality analysis, by optimizing evaluation and test, decoding conversion is carried out to monitoring video, efficiently solves the monitoring video file decoding of unknown format and the problem of conversion.
The technical solution adopted in the present invention is:
A coding/decoding method for monitoring video file, comprising:
S1: the type of coding reading monitoring video file;
S2: judge type of coding by file header, delivers to this decoder by monitoring video file decode if any available universal decoder is then direct, otherwise enter step S3;
S3: by the mode pre-read monitoring video file, the frame head of file reading, to the beginning of next frame, obtains this frame data, locates the first frame, and get backward from this frame 200 frame data carry out next step attempt;
S4: the multiple decoder of initialization prepares decoding, imports 200 frame data into each decoder and carries out iterative decoding, determine a kind of optimized decoder Db;
S5: remaining for file frame is continued use Db to decode.
Preferably, comprising by pre-reading monitoring video file described in step S3: the frame head reading the first frame, finding second frame head subsequently, take out data between these two frame heads as the first frame data.
Preferably, determine described in step S4 that a kind of optimized decoder Db comprises:
S41: preferentially attempt universal decoder, sends monitoring video file into universal decoder and decodes, stored away by the RGB24 bitmap caching decoded, as the reference value that follow-up test is evaluated, decode, enter step S42 if cannot carry out; S42: the self-defined decoder of initialization is D1, D2....Dn;
S43: front 200 two field pictures taking out monitoring video file, and it is sent into respectively in the self-defined decoder described in step S42 and decode; If decoding functions has return value, then the RGB24 data bitmap obtained of decoding is stored; If there is no return value, eliminate corresponding decoder;
S44:[Dx] be the decoder collection successfully obtaining RGB24 data, the RGB data that wherein various decoder obtains evaluated, pick out that a color balances most, edge is the most clear, the result that noise is minimum, is weighted result; Result of calculation is labeled as failure lower than the decoder of threshold value, the decoder of result of calculation higher than threshold value is labeled as successfully, and by the result of successful decoder stored in memory;
S45: the decoded result that the result of successful decoder and step S41 obtain is compared again; Mutually compared by the weighted calculation mode described in step S44, weighing computation results is soprano, is labeled as optimized decoder Db.
Present invention also offers a kind of decode system of monitoring video file, described system comprises:
For reading the module of the type of coding of monitoring video file;
For being judged the module of type of coding by file header, monitoring video file is delivered to this decoder decode if any available universal decoder is then direct, otherwise send into next module;
For the mode by pre-reading monitoring video file, the frame head of file reading, to the beginning of next frame, obtains this frame data, locates the first frame, and from this frame, get the module that 200 frame data carry out next step trial backward;
Prepare decoding for the multiple decoder of initialization, import 200 frame data into each decoder and carry out iterative decoding, determine the module of a kind of optimized decoder Db;
Db is used to carry out the module of decoding for being continued by remaining for file frame.
Accompanying drawing explanation
Fig. 1 represents a kind of flow chart of coding/decoding method of monitoring video file;
Fig. 2 represents the flow chart of the trial decoding effort of unknown coded system file.
Embodiment
Hereinafter will be described in detail to embodiments of the invention by reference to the accompanying drawings.It should be noted that, when not conflicting, the feature that the embodiment in the application and embodiment gather can combination in any mutually.
The coding/decoding method of a kind of monitoring video file provided by the invention, mainly by calling the method for testing of various decoder and a kind of optimal selection decoder Db, decode to monitoring video file, specific implementation method as shown in Figure 1, comprises the following steps:
S1: the type of coding reading monitoring video file.
For monitoring video, coded system is very numerous and diverse, obtain document No. mode by canonical function and mainly contain h264, xvid, divx, pcm, mpeg2, mpeg4 etc., these are known coded mode, usually appear at civil area, wherein major part all can use universal decoder to decode.Another is widely used video format in some industries, and as the mp4 form that Haikang prestige is looked, the open decoder file utilizing Haikang to provide can directly be decoded.And the present invention is mainly for the third, also namely cannot be obtained the monitoring video file of document No. mode by canonical function, propose a kind of technical solution.
S2: judge type of coding by file header, then directly delivers to this decoder if any available universal decoder and decodes, otherwise enter next step.
In technical field of video monitoring, what some file adopted is that the mode be encrypted by standard video format is encoded.Mode the most common adds some ciphertexts at the head of frame of video, and we are by the identification of frame data readable taking-up fileinfo, those are not easy identified information, as the string code after frame head.The frame head data of camouflage is removed, obtains one group of identification information, the coded system of these identification informations this file often, now, more correspondingly sent into universal decoder and decode.
S3: by the mode pre-read video file, the frame head of file reading, to the beginning of next frame, obtains this frame data, locates the first frame, gets 200 frame data backward and carry out next step trial from this frame.
This method is applicable to the monitoring video that cannot obtain document No. mode.Now, first file is disassembled, read the frame head Fhead1 of the first frame, find second frame head Fhead2 subsequently, take out data between these two frame heads as the first frame data, be stored in a buffer memory, recirculation is subsequently fetched data, and gets front 200 Frame storage of this file in a buffer.
S4: the multiple decoder of initialization prepares decoding, imports 200 frame data into each decoder and carries out iterative decoding, determine a kind of optimized decoder Db.
For the file that cannot obtain coded system, can only be decoded by the mode of attempting decoding at present, the mode that present invention employs a kind of automatic decoder evaluation carries out decoding trial, and evaluation and test contrast is carried out to decoded result, change traditional manual trial, visually observe the mode of decoding effect.There is at present the Video Decoder that tens kinds different on the market, 200 frame data obtained are sent into respectively the various decoders that initialization completes and decode in S3.The bitmap data bitmap obtained is stored in both the buffers in the mode of RGB24.The RGB24 data be correctly decoded are carried out secondary analysis, is compared by image evaluation method, retain a kind of decoder outcomes of optimum, obtain optimum decoder Db.
S5: remaining for file frame is continued use Db to decode.
After obtaining optimum decoder Db, remaining for file frame is disassembled out according to the method described by S3, adopt Db to decode, finally obtain the RGB24 data of Utopian frame of video.
Wherein, as shown in Figure 2, the concrete steps of the automatic decoding device evaluation method described in above-mentioned S4 are as follows:
S41: preferentially attempt universal decoder, sends into universal decoder, as avcodec, avformat etc. by the known file head recognized.The RGB24 bitmap decoded is stored away, as the reference value that follow-up test is evaluated.Due to the complexity of monitoring video, although some file can be decoded by universal decoder identification, best decoding effect might not be obtained.So, need the evaluation module by these decoded results are sent into below to carry out optimum decoder evaluation.
S42: the self-defined decoder of initialization is D1, D2....Dn.Self-defined decoder is some existing decode video files devices, as avcodec, ffmpeg etc., is a kind of programmable dynamic base, can be used for the video decode of some form.The self-defined decoder described in the present invention is integrated with various video decoder for attempting decoding.
S43: front 200 two field pictures taking out monitoring video file, and it is sent into respectively in the decoder described in S42 and decode, as decoding functions has return value, then the RGB24 data obtained of decoding are stored, if there is no return value, eliminate corresponding decoder.200 frame data are sent into decoder by the interface function of each decoder decode, as avcodec_FrameInsert=[f1, f2......f200], obtain the RGB24 data bitmap of one group of 200 pair, deposit in a buffer and prepare for next step.When attempting, if front 25 two field pictures send into a decoder, all there is no return value data, then abandoned.
S44:[Dx] be the decoder collection successfully obtaining RGB24 data, the RGB data that wherein various decoder obtains is evaluated, picks out that a color balances most, edge is the most clear, the result that noise is minimum.Here adopt a kind of method for evaluating video quality of improvement, based on the feature of surveillance video, by HVS method for evaluating video quality, draw color balance value a: color.Meanwhile, frame-to-frame differences calculating is carried out to this 200 two field picture.The result reflection of usual frame-to-frame differences be the sequence degree of image, obtain the value of an average frame-to-frame differences, be considered as scene stable current field value: diff.Then an image sharpness value edge is calculated by object edge definition algorithm.The mode judged eventually through weighting draws a characteristic value result, i.e. Result=Color*ColorRate+Diff*DiffRate+Edge*EdgeRate, itself and the threshold value L set are compared, if Result < is L, then corresponding decoder is set to failure, if Result > is L, then this decoder is designated as successfully, enters the memory comparing calculating.Now by successful decoder weight results, again compare calculating, value the maximum is then designated as optimum decoder, is defined as Dg.
S45: the result that this result and S41 obtain again compared, obtains an optimized decoder Db.Herein again according to the method for S44, the result that the decoded result of Dg and universal decoder obtain compared, most the superior is then out selected, is defined as optimum decoder Db.
Present invention also offers a kind of decode system of monitoring video file, described system comprises:
For reading the module of the type of coding of monitoring video file;
For being judged the module of type of coding by file header, monitoring video file is delivered to this decoder decode if any available universal decoder is then direct, otherwise send into next module;
For the mode by pre-reading monitoring video file, the frame head of file reading, to the beginning of next frame, obtains this frame data, locates the first frame, and from this frame, get the module that 200 frame data carry out next step trial backward;
Prepare decoding for the multiple decoder of initialization, import 200 frame data into each decoder and carry out iterative decoding, determine the module of a kind of optimized decoder Db;
Db is used to carry out the module of decoding for being continued by remaining for file frame.
Below a specific embodiment according to above execution mode:
Input a monitoring video file aaa.xxx at decoder place, by standard video coder function file reading type of coding, obtaining type of coding is null, namely cannot obtain type of coding.Now the first frame of file reading, reads and finds that frame head data is 0x30306463, find each frame all to have identical frame head, represents that file can be decoded.Read next 0x30306463, find the head of next frame, obtain the data of the data between two frame fhead1 and fhead2 as a frame, by that analogy, obtain front 200 frame data and be stored in buffer.
Initialization avcodec, avformat, avutil, swscale, DCsdk, H264decV33 decoder carries out trial decoding.200 frame data obtained are sent into above decoder successively decode, obtain data bitmap set respectively: D1frame=[avcodec_frame], D2frame=[avformat_frame], D3frame=[avutil_frame], D4frame=[swscale_frame], D5frame=[DCsdk_frame].
Data bitmap in each set is given in a streaming manner HVS video quality evaluation module and obtain image color quality ColorD1=4, ColorD2=5, ColorD3=1, ColorD4=4, ColorD5=8.Again these frames are carried out image stabilization degree and calculate stability coefficient DiffD1=5, DiffD2=4, DiffD3=3, DiffD4=5, DiffD5=7.And then carry out picture edge calculations, calculate the Effect value EdgeD1=3 that definition is the highest, EdgeD2=3, EdgeD3=4, EdgeD4=5, EdgeD5=6.Obtain our defined formula Result=Color*ColorRate+Diff*DiffRate+Edge*EdgeRate after above-mentioned parameter.Set ColorRate=40% based on experience value, DiffrRate=30%, EdgeRate=30%.Obtain ResultD1=4 in sum, ResultD2=4.1, ResultD3=2.5, ResultD4=4.6, ResultD5=7.6.Based on experience value, we are setting threshold L=4.5, and for this section of video, decoding effect is better.So, D1, D2, D3 are all less than L value, eliminated, now judge that the decoder being greater than L value has D4 and D5 again, relatively find that the effect of D5 is best, thus, judge that H264decV33 is optimum decoder, now, using the optimum decoder Db of H264decV33 decoder as aaa.xxx file, more remaining frame is decoded according to above-mentioned decoding process, obtain the RGB24 bitmap file of all frames of this file, select the xvid coded system given tacit consent to again, file transform is become aaa.avi formatted file.
The mediaplayer software using windows system to carry can normal play, and the coded system that function obtains aaa.avi file is xvid to adopt standard code mode to check, arrives this, then completes decoding and the form conversion work of this video file.
The all or part of step that one of ordinary skill in the art will appreciate that in said method is carried out instruction related hardware by program and is completed, and described program can be stored in computer-readable recording medium.Alternatively, all or part of step of above-described embodiment also can use one or more integrated circuit to realize.Correspondingly, each module/unit in above-described embodiment can adopt the form of hardware to realize, and the form of software function module also can be adopted to realize.Embodiments of the present invention are not limited to the combination of the hardware and software of any particular form.
These are only the preferred embodiments of the present invention, certainly, embodiment of the present invention also can have other various embodiments.When not deviating from the present invention's spirit and essence thereof; those of ordinary skill in the art are when making various corresponding change and distortion according to embodiment of the present invention, but these change accordingly and are out of shape the protection range that all should belong to the claim appended by the application.
Claims (4)
1. a coding/decoding method for monitoring video file, is characterized in that described method comprises:
S1: the type of coding reading monitoring video file;
S2: judge type of coding by file header, delivers to this decoder by monitoring video file decode if any available universal decoder is then direct, otherwise enter step S3;
S3: by the mode pre-read monitoring video file, the frame head of file reading, to the beginning of next frame, obtains this frame data, locates the first frame, and get backward from this frame 200 frame data carry out next step attempt;
S4: the multiple decoder of initialization prepares decoding, imports 200 frame data into each decoder and carries out iterative decoding, determine a kind of optimized decoder Db;
S5: remaining for file frame is continued use Db to decode;
Determine described in step S4 that a kind of optimized decoder Db comprises:
S41: preferentially attempt universal decoder, sends monitoring video file into universal decoder and decodes, stored away by the RGB24 bitmap caching decoded, as the reference value that follow-up test is evaluated, decode, enter step S42 if cannot carry out;
S42: the self-defined decoder of initialization is D1, D2....Dn;
S43: front 200 two field pictures taking out monitoring video file, and it is sent into respectively in the self-defined decoder described in step S42 and decode; If decoding functions has return value, then the RGB24 data bitmap obtained of decoding is stored; If there is no return value, eliminate corresponding decoder;
S44:[Dx] be the decoder collection successfully obtaining RGB24 data, the RGB data that wherein various decoder obtains evaluated, pick out that a color balances most, edge is the most clear, the result that noise is minimum, is weighted result; Result of calculation is labeled as failure lower than the decoder of threshold value, the decoder of result of calculation higher than threshold value is labeled as successfully, and by the result of successful decoder stored in memory;
S45: the decoded result that the result of successful decoder and step S41 obtain is compared again; Mutually compared by the weighted calculation mode described in step S44, weighing computation results is soprano, is labeled as optimized decoder Db.
2. the method for claim 1, is characterized in that comprising by pre-reading monitoring video file described in step S3: the frame head reading the first frame, finding second frame head subsequently, takes out data between these two frame heads as the first frame data.
3. a decode system for monitoring video file, is characterized in that described system comprises:
For reading the module of the type of coding of monitoring video file;
For being judged the module of type of coding by file header, monitoring video file is delivered to this decoder decode if any available universal decoder is then direct, otherwise send into next module;
For the mode by pre-reading monitoring video file, the frame head of file reading, to the beginning of next frame, obtains this frame data, locates the first frame, and from this frame, get the module that 200 frame data carry out next step trial backward;
Prepare decoding for the multiple decoder of initialization, import 200 frame data into each decoder and carry out iterative decoding, determine the module of a kind of optimized decoder Db;
Db is used to carry out the module of decoding for being continued by remaining for file frame;
Describedly determine that a kind of optimized decoder Db comprises:
S41: preferentially attempt universal decoder, sends monitoring video file into universal decoder and decodes, stored away by the RGB24 bitmap caching decoded, as the reference value that follow-up test is evaluated, decode, enter step S42 if cannot carry out;
S42: the self-defined decoder of initialization is D1, D2....Dn;
S43: front 200 two field pictures taking out monitoring video file, and it is sent into respectively in the self-defined decoder described in step S42 and decode; If decoding functions has return value, then the RGB24 data bitmap obtained of decoding is stored; If there is no return value, eliminate corresponding decoder;
S44:[Dx] be the decoder collection successfully obtaining RGB24 data, the RGB data that wherein various decoder obtains evaluated, pick out that a color balances most, edge is the most clear, the result that noise is minimum, is weighted result; Result of calculation is labeled as failure lower than the decoder of threshold value, the decoder of result of calculation higher than threshold value is labeled as successfully, and by the result of successful decoder stored in memory;
S45: the decoded result that the result of successful decoder and step S41 obtain is compared again; Mutually compared by the weighted calculation mode described in step S44, weighing computation results is soprano, is labeled as optimized decoder Db.
4. system as claimed in claim 3, is characterized in that describedly comprising by pre-reading monitoring video file: the frame head reading the first frame, finding second frame head subsequently, takes out data between these two frame heads as the first frame data.
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| CN101350858A (en) * | 2008-09-10 | 2009-01-21 | 深圳华为通信技术有限公司 | Method for decoding short message and user terminal |
| CN102404556A (en) * | 2011-11-30 | 2012-04-04 | 公安部第一研究所 | Universal play system and method for surveillance tape files |
| CN102685481A (en) * | 2011-03-18 | 2012-09-19 | 腾讯科技（深圳）有限公司 | Method and system for processing media files |
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| CN101350858A (en) * | 2008-09-10 | 2009-01-21 | 深圳华为通信技术有限公司 | Method for decoding short message and user terminal |
| CN102685481A (en) * | 2011-03-18 | 2012-09-19 | 腾讯科技（深圳）有限公司 | Method and system for processing media files |
| CN102404556A (en) * | 2011-11-30 | 2012-04-04 | 公安部第一研究所 | Universal play system and method for surveillance tape files |
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